202001111121221 has 4 divisors (see below), whose sum is σ = 202003696416492. Its totient is φ = 201998525825952.

The previous prime is 202001111121209. The next prime is 202001111121253. The reversal of 202001111121221 is 122121111100202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113271022408996 + 88730088712225 = 10642886^2 + 9419665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202001111121221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202001111121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202001111121281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1292530430 + ... + 1292686703.

It is an arithmetic number, because the mean of its divisors is an integer number (50500924104123).

Almost surely, 2^{202001111121221} is an apocalyptic number.

It is an amenable number.

202001111121221 is a deficient number, since it is larger than the sum of its proper divisors (2585295271).

202001111121221 is an equidigital number, since it uses as much as digits as its factorization.

202001111121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585295270.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 202001111121221 its reverse (122121111100202), we get a palindrome (324122222221423).

The spelling of 202001111121221 in words is "two hundred two trillion, one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".